Frumnotyeshivish, I disagree. I think you are the one being extreme.
It is true that if someone is motivated enough, they can get whatever access they want, and proper chinuch is always necessary, so that there’s motivation to avoid issur.
But, there’s a yetzer hora, and I think (certainly hope) you would agree that giving a kid unfiltered access is a bad idea.
So, crazybrit wants to draw the line earlier, and thinks a kid shouldn’t have a device which can be fiddled with to get access. That’s a very reasonable place to draw the line, and although you may choose to draw the line elsewhere, calling that panic and extreme is wrong.